andesite

[ an-duh-zahyt ]
/ ˈæn dəˌzaɪt /

noun

a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite.

Origin of andesite

1840–50; named after Andes; see -ite1

OTHER WORDS FROM andesite

an·de·sit·ic [an-duh-zit-ik] /ˌæn dəˈzɪt ɪk/, adjective

Example sentences from the Web for andesite

British Dictionary definitions for andesite

andesite
/ (ˈændɪˌzaɪt) /

noun

a fine-grained tan or grey volcanic rock consisting of plagioclase feldspar, esp andesine, amphibole, and pyroxene

Word Origin for andesite

C19: from Andes + -ite 1

Scientific definitions for andesite

andesite
[ ăndĭ-zīt′ ]

A gray, fine-grained volcanic rock. Andesite consists mainly of sodium-rich plagioclase feldspar and one or more mafic minerals such as biotite, hornblende, or pyroxene. It often contains small, visible crystals (phenocrysts) of plagioclase.